42403540421 has 72 divisors (see below), whose sum is σ = 51126083424. Its totient is φ = 34843374720.

The previous prime is 42403540391. The next prime is 42403540429. The reversal of 42403540421 is 12404530424.

It is not a de Polignac number, because 42403540421 - 2¹⁰ = 42403539397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42403540429) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 632888630 + ... + 632888696.

It is an arithmetic number, because the mean of its divisors is an integer number (710084492).

Almost surely, 2^42403540421 is an apocalyptic number.

It is an amenable number.

42403540421 is a deficient number, since it is larger than the sum of its proper divisors (8722543003).

42403540421 is a wasteful number, since it uses less digits than its factorization.

42403540421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The spelling of 42403540421 in words is "forty-two billion, four hundred three million, five hundred forty thousand, four hundred twenty-one".